Muffler



FIG. 1 is a front left top perspective view of a muffler showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The left and right elevational views and the rear elevational view are identical to the front elevational view shown in FIG. 2. 

The ornamental design for a muffler, as shown and described. 